Spray gun



FIG. 1 is a perspective of a spray gun embodying the design of the present invention;

FIG. 2 is a front elevational view of the spray gun;

FIG. 3 is a left side elevational view of the spray gun;

FIG. 4 is a right side elevational view of the spray gun;

FIG. 5 is a top plan view of the spray gun; and,

FIG. 6 is a bottom plan view of the spray gun. 

The ornamental design for a spray gun, as shown and described. 